refactor: rename Wizamart to Orion across entire codebase

Replace all ~1,086 occurrences of Wizamart/wizamart/WIZAMART/WizaMart
with Orion/orion/ORION across 184 files. This includes database
identifiers, email addresses, domain references, R2 bucket names,
DNS prefixes, encryption salt, Celery app name, config defaults,
Docker configs, CI configs, documentation, seed data, and templates.

Renames homepage-wizamart.html template to homepage-orion.html.
Fixes duplicate file_pattern key in api.yaml architecture rule.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/marketing/strategy/customer-marketing-positioning.md

@@ -20,7 +20,7 @@ Letzshop owns the customer relationship. Stores:
 
 ```
 ┌────────────────────────────────────────────┐
-│  Wizamart Dashboard                        │
+│  Orion Dashboard                        │
 │  ┌──────────────────────────────────────┐  │
 │  │  Customers (142)        [Export CSV] │  │
 │  ├──────────────────────────────────────┤  │
@@ -86,7 +86,7 @@ Letzshop owns the customer relationship. Stores:
 
 ```
 ┌─────────────┐         ┌─────────────┐
-│  Wizamart   │ ──────► │  Mailchimp  │
+│  Orion   │ ──────► │  Mailchimp  │
 │             │  Sync   │             │
 │  Customers  │ ◄────── │  Audiences  │
 │  Orders     │         │  Tags       │
@@ -114,7 +114,7 @@ Letzshop owns the customer relationship. Stores:
 
 ### Level 4: Built-in Email Marketing (Very Complex)
 
-**What it is:** Send emails directly from Wizamart.
+**What it is:** Send emails directly from Orion.
 
 **Required:**
 - Email template builder
@@ -222,7 +222,7 @@ Letzshop owns the customer relationship. Stores:
 
 ### The Hybrid Pitch
 
-> "Wizamart gives you the tools Letzshop doesn't:
+> "Orion gives you the tools Letzshop doesn't:
 >
 > - **Correct invoices** with proper VAT for any EU country
 > - **Real inventory** across all your channels